Fig. 4

Aspects of the BCI-FES software. a Diagram of BCI software architecture and GUI aspects. b Screenshot of the training video. The hand squeezes the ball and relaxes. Repeated 10 times. c Main screen of the BCI programme. Setting options are in the upper portion of the window. The gauge is used for neurofeedback, ‘Start’ runs the programme, ‘Stop’ stops it and ‘Exit’ exits the BCI application